Injection of parameters into signal handlers is deprecated. Use JavaScript functions with formal par-CodePudding

I have the following issue.

I'm using QML for my application frontend.

For one of my componentes I use a ListView that uses a custom delegate that contains it's own index (and some other data) in a a variable called vmIndex. Here is the declaration of the list view:

                ListView {
                    id: studySelectListView
                    anchors.fill: parent
                    model: studySelectList
                    delegate: VMStudyEntry {
                        width: studySelectBackground.width
                        height: studySelectBackground.height/4
                        onItemSelected: {
                            selectionChanged(vmIndex,true); // LINE WITH WARNING
                        }
                    }
                }

Now, when the item is selected I need to call a function called selectionChange and send vmIndex as a parameter to that function.

The VMStudyEntry is this:

Item {
    id: vmStudyEntry

    signal itemSelected(int vmIndex);

    MouseArea {
        anchors.fill: parent
        onClicked: {
            vmStudyEntry.itemSelected(vmIndex);
        }
    }
    Rectangle {
        id: dateRect
        color: vmIsSelected? "#3096ef" : "#ffffff"
        border.color: vmIsSelected? "#144673" : "#3096ef"
        radius: mainWindow.width*0.005
        border.width: mainWindow.width*0.0005
        anchors.fill: parent
        Text {
            font.family: viewHome.gothamR.name
            font.pixelSize: 12*viewHome.vmScale
            text: vmStudyName
            color: vmIsSelected? "#ffffff" : "#000000"
            anchors.centerIn: parent
        }
    }

}

This all worked perfectly on Qt 5.13.2. But I now moved to Qt 6.1.2. The code actually still works, as far as I can see but I'm getting this warning:

Parameter "vmIndex" is not declared. Injection of parameters into signal handlers is deprecated. Use JavaScript functions with formal parameters instead.

The line that has this warning is identifed above. Can anyone tell me how I can redefine this in order to make this warning go away?

CodePudding user response：

Take a look here, you need the following syntax in Qt6:

onItemSelected: function(vmIndex) { selectionChanged(vmIndex,true); }

Or a more lambda-like options if you fancy:

onItemSelected: vmIndex => selectionChanged(vmIndex, true)